Copy and Paste Specific character into existing pose
If I understand the question, I think the best thing to do is to make a file of just the armature doing the animations. Select "Save as" and do a different name, then, at frame 0 have the armature in a neutral position (and have the animation start at frame 1) so you can copy the meshes into the file and rig the meshes for different characters onto the neutral position.
Just return to the original file and "save as" again for a new character.
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